Python Regex: Extract all occurences of a substring within a string

Question

I am trying to extract all occurrences of a substring within a string using Python Regex. This is what I have tried:

import re
line = "The dimensions of the first rectangle: 10'x20', second rectangle: 10x35cm, third rectangle: 30x35cm"
m = re.findall(r'\d+x.*?[a-zA-Z]', line)
print (m)

The output I am getting is ['10x35c', '30x35c']

The output I am trying to achieve is ['10'x20'', '10x35cm', '30x35cm']

You may use this regex: \d+'?x\d+'?(?:[a-zA-Z]+)?

anubhava
– anubhava

2021-01-12 16:59:24 +00:00
Commented Jan 12, 2021 at 16:59 — anubhava
– anubhava, Commented Jan 12, 2021 at 16:59
Try to explain in english what you are trying tô extract

vmp
– vmp

2021-01-12 16:59:54 +00:00
Commented Jan 12, 2021 at 16:59 — vmp
– vmp, Commented Jan 12, 2021 at 16:59

anubhava · Accepted Answer · 2021-01-12 17:28:01Z

1

You may use this regex:

r"\d+['\"]?x\d+['\"]?(?:\s*[a-zA-Z]+)?"

RegEx Demo

Code:

>>> import re
>>> line = "The dimensions of the first rectangle: 10'x20', second rectangle: 10x35cm, third rectangle: 30x35cm"
>>> print (re.findall(r"\d+['\"]?x\d+['\"]?(?:\s*[a-zA-Z]+)?", line))
["10'x20'", '10x35cm', '30x35cm']

RegEx Details:

\d+: Match 1+ digits
['\"]?: Match optional ' or "
x: Match letter x
\d+: Match 1+ digits
['\"]?: Match optional ' or "
(?:\s*[a-zA-Z]+)?: Match optional units comprising 1+ letters

edited Jan 12, 2021 at 17:28

answered Jan 12, 2021 at 17:03

anubhava

790k67 gold badges603 silver badges671 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Mayank Porwal · Accepted Answer · 2021-01-12 17:11:08Z

1

You can do this without regex using split:

In [1089]: m = [i.split(':')[1].strip() for i in line.split(',')]

In [1090]: m
Out[1090]: ["10'x20'", '10x35cm', '30x35cm']

edited Jan 12, 2021 at 17:11

answered Jan 12, 2021 at 17:00

Mayank Porwal

34.2k9 gold badges45 silver badges65 bronze badges

1 Comment

Animeartist Over a year ago

Thank you for your kind effort, but I wanted to use regex though.

Ryszard Czech · Accepted Answer · 2021-01-12 22:32:43Z

Use

import re
string = "The dimensions of the first rectangle: 10'x20', second rectangle: 10x35cm, third rectangle: 30x35cm"
print(re.findall(r"""\d+'?x\d+'?(?: *[a-z]+)?""", string, re.I))

Results: ["10'x20'", '10x35cm', '30x35cm']

See Python proof. re.I stands for case insensitive matching.

Explanation:

--------------------------------------------------------------------------------
  \d+                      digits (0-9) (1 or more times (matching
                           the most amount possible))
--------------------------------------------------------------------------------
  '?                       '\'' (optional (matching the most amount
                           possible))
--------------------------------------------------------------------------------
  x                        'x'
--------------------------------------------------------------------------------
  \d+                      digits (0-9) (1 or more times (matching
                           the most amount possible))
--------------------------------------------------------------------------------
  '?                       '\'' (optional (matching the most amount
                           possible))
--------------------------------------------------------------------------------
  (?:                      group, but do not capture (optional
                           (matching the most amount possible)):
--------------------------------------------------------------------------------
     *                       ' ' (0 or more times (matching the most
                             amount possible))
--------------------------------------------------------------------------------
    [a-z]+                   any character of: 'a' to 'z' (1 or more
                             times (matching the most amount possible))
--------------------------------------------------------------------------------
  )?                       end of grouping

Collectives™ on Stack Overflow

Python Regex: Extract all occurences of a substring within a string

3 Answers 3

Comments

1 Comment

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Comments

1 Comment

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related